MKS ACE pedal quick release buckle upgradematerial:titanium alloy + AL weight about 17.4g/pcsstainless steel +AL weight about 27.2g/pcs The inside of the quick release buckle is TC4 titanium alloy(stainless steel), and the outer casing is 6061 aluminum alloy. The weight loss is balanced with the strength. Compared with the original steel quick release buckle, the pair has only half of the original weight, and the weight loss is obvious.